CN217381065U - Hydrostatic system and engineering machinery vehicle - Google Patents
Hydrostatic system and engineering machinery vehicle Download PDFInfo
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- CN217381065U CN217381065U CN202221215363.3U CN202221215363U CN217381065U CN 217381065 U CN217381065 U CN 217381065U CN 202221215363 U CN202221215363 U CN 202221215363U CN 217381065 U CN217381065 U CN 217381065U
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Abstract
The utility model discloses a quiet hydraulic system and engineering machine tool vehicle relates to engineering machine tool vehicle technical field. The hydrostatic system comprises a hydraulic pump, a hydraulic motor and a main oil tank, wherein the hydraulic pump is communicated with the hydraulic motor to form a closed loop; two oil return ports are respectively arranged on a shell of the hydraulic pump and a shell of the hydraulic motor, one oil return port of the hydraulic pump is communicated with one oil return port of the hydraulic motor, and the other oil return port of the hydraulic motor is communicated with an oil return port of the main oil tank; and the other oil return port of the hydraulic pump is communicated with the main oil tank through a back pressure valve to form a serial oil return pipeline. The traveling device of the engineering machinery vehicle is driven by the hydrostatic system, oil return of all hydraulic elements in the hydrostatic system is communicated, oil temperature balance can be achieved, reliability and volumetric efficiency of all the hydraulic elements are improved, and the engineering machinery vehicle can work more efficiently and saves energy.
Description
Technical Field
The utility model relates to an engineering machine tool vehicle technical field especially relates to a hydrostatic system and engineering machine tool vehicle.
Background
With the development of economy and social progress, the application of the hydrostatic system in various engineering machinery vehicles is more and more extensive.
Generally, in a loader hydrostatic system, hydraulic oil is used as a medium for energy transmission, and mainly circulates in a hydraulic pump and a hydraulic motor, the leaked hydraulic oil returns to an oil tank through shell oil return ports of the hydraulic pump and the hydraulic motor during circulation, and a supplement oil pump supplements the hydrostatic system with the leaked hydraulic oil. In the working process, the return oil of the shell of each hydraulic element is directly connected with an oil tank through a rubber pipe, and meanwhile, the oil supplementing pump absorbs oil from the oil tank shared by each hydraulic system of the whole machine. Although the return oil of the hydraulic pump and the hydraulic motor is directly connected with the oil tank, the back pressure in the shell can be small, and the oil seal of the hydraulic pump and the hydraulic motor is protected. However, in the actual working process, the working loads of the hydraulic pump and the hydraulic motor are different, which means that the oil temperatures of the hydraulic oil accumulated in the casings of the hydraulic elements are different, and the casings of the hydraulic elements are not connected with each other, so that the oil temperatures of the casings of the hydraulic elements are high or low, the oil temperatures of the casings of the hydraulic elements are too high, the internal sealing aging of the hydraulic elements is accelerated, the leakage amount of the hydraulic elements is increased, and the volumetric efficiency is reduced. In the practical application process, in order to protect hydraulic elements, some hydrostatic systems are also provided with an oil temperature sensor at the oil return position of a shell, and if the oil temperature at a certain position of the hydrostatic system is too high, the power limiting operation can be automatically carried out, but the working efficiency of the whole hydrostatic system is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a hydrostatic system and engineering machinery vehicle, the casing oil return of each hydraulic component in this hydrostatic system is intercommunicated, not only can protect the hydraulic component, but also can make the oil temperature balanced; the working efficiency of the engineering machinery vehicle is improved.
To achieve the purpose, the utility model adopts the following technical proposal:
a hydrostatic system comprises a hydraulic pump, a hydraulic motor and a main oil tank, wherein the hydraulic pump is communicated with the hydraulic motor to form a closed loop; two oil return ports are respectively arranged on a shell of the hydraulic pump and a shell of the hydraulic motor, one oil return port of the hydraulic pump is communicated with one oil return port of the hydraulic motor, and the other oil return port of the hydraulic motor is communicated with an oil return port of the main oil tank; and the other oil return port of the hydraulic pump is communicated with the main oil tank through a back pressure valve to form a serial oil return pipeline.
As an alternative scheme of the hydrostatic system, the hydrostatic system further comprises an oil supplementing pump and an auxiliary oil tank, an oil inlet of the auxiliary oil tank is communicated with an oil outlet of a radiator of the engineering machinery vehicle, an oil outlet of the auxiliary oil tank is communicated with an oil inlet of the oil supplementing pump, and an oil outlet of the oil supplementing pump is communicated with an oil inlet of the hydraulic pump.
As an alternative to the hydrostatic system, a communication line is provided between the secondary oil tank and the main oil tank, and the oil in the secondary oil tank can enter the main oil tank through the communication line when the secondary oil tank is filled with the oil.
As an alternative of the hydrostatic system, a switching valve is arranged on the communicating pipeline, and when the auxiliary oil tank is filled with oil, the switching valve is controlled to be opened, so that the oil in the auxiliary oil tank enters the main oil tank through the communicating pipeline.
As an alternative to the hydrostatic system, the communication line includes an oil inlet of the communication line, the oil inlet of the communication line is communicated with an upper portion of the secondary oil tank, and when the oil in the secondary oil tank reaches the oil inlet of the communication line, the oil in the secondary oil tank enters the main oil tank through the communication line.
As an alternative to a hydrostatic system, the oil replenishment pump is integrated into the hydraulic pump.
As an alternative to a hydrostatic system, the set pressure value of the back pressure valve is smaller than the minimum rated pressure value of the housing of the individual hydraulic elements in the series return line.
As an alternative to the hydrostatic system, the hydraulic motors comprise a first hydraulic motor and a second hydraulic motor, and the hydraulic pump comprises an upper oil return of a housing of the hydraulic pump and a lower oil return of a housing of the hydraulic pump; the first hydraulic motor comprises an upper oil return port of a shell of the first hydraulic motor and a lower oil return port of the shell of the first hydraulic motor; the second hydraulic motor comprises an upper oil return port of a shell of the second hydraulic motor and a lower oil return port of the shell of the second hydraulic motor; the lower oil return port of the shell of the hydraulic pump is communicated with the lower oil return port of the shell of the first hydraulic motor, the upper oil return port of the shell of the first hydraulic motor is communicated with the lower oil return port of the shell of the second hydraulic motor, and the upper oil return port of the shell of the second hydraulic motor is communicated with the oil return port of the main oil tank; and an oil return port at the upper part of the shell of the hydraulic pump is communicated with the main oil tank through the back pressure valve.
The engineering machinery vehicle comprises a traveling device, a working device, a steering device and a radiator, wherein the traveling device is driven by a hydrostatic system according to any one of the schemes, a main oil tank supplies oil to the traveling device, the working device and the steering device are driven by an open hydraulic system, and at least one of an oil return port of a hydraulic circuit of the working device and an oil return port of a hydraulic circuit of the steering device is communicated with an oil inlet of the radiator.
As an alternative to the work machine vehicle, the work machine vehicle is a loader.
The utility model has the advantages that:
the utility model provides a hydrostatic system, through communicating one of them oil return opening of the casing with the hydraulic pump with one of them oil return opening of the casing of hydraulic motor, another oil return opening of the casing of hydraulic motor communicates with the oil return opening of main oil tank, adopt the connected mode of establishing ties with the oil return of each hydraulic component's casing in the hydrostatic system, make the inside oil temperature of each hydraulic component keep unanimous, avoid the oil temperature of the oil return of partial hydraulic component's casing too high, lead to the inside sealed ageing of hydraulic component to accelerate, cause hydraulic component's leakage volume big, volumetric efficiency descends; and the other oil return port of the shell of the hydraulic pump is communicated with the main oil tank through a backpressure valve, and the backpressure valve is opened to eliminate the pressure peak of the shell loop of each hydraulic element and protect the hydraulic element.
The utility model provides an engineering machinery vehicle, engineering machinery vehicle's running gear adopts above-mentioned hydrostatic system, and each hydraulic component's oil return intercommunication can reach oil temperature balance in this hydrostatic system, has improved each hydraulic component's reliability and volumetric efficiency for engineering machinery vehicle work is more efficient energy-conserving.
Drawings
FIG. 1 is a schematic diagram of a prior art hydrostatic system;
fig. 2 is a schematic structural diagram of a hydrostatic system provided by an embodiment of the present invention.
In the figure:
100. a heat sink;
101. an oil inlet of the radiator; 102. an oil outlet of the radiator;
1. a hydraulic pump; 2. a main oil tank; 3. a first hydraulic motor; 4. a second hydraulic motor; 5. a back pressure valve; 6. a secondary fuel tank; 7. an oil tank; 8. an oil replenishing pump; 9. a communicating pipeline;
11. a housing oil return port of the hydraulic pump; 31. a housing oil return port of the first hydraulic motor; 41. a housing oil return port of the second hydraulic motor; 71. an oil return port of the oil tank; 91. an oil inlet of the communicating pipeline;
111. an oil return port at the upper part of the shell of the hydraulic pump; 112. an oil return port at the lower part of the shell of the hydraulic pump; 311. an oil return port at the upper part of the shell of the first hydraulic motor; 312. an oil return port at the lower part of the housing of the first hydraulic motor; 411. an oil return port at the upper part of the shell of the second hydraulic motor; 412. and an oil return port at the lower part of the shell of the second hydraulic motor.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly and encompass, for example, both fixed and removable connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in direct contact with the second feature but being in contact with the second feature by another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
The embodiment provides an engineering machinery vehicle, which comprises a travelling device, a working device, a steering device and a radiator, wherein the travelling device is driven by a hydrostatic system, a main oil tank supplies oil to the travelling device, the working device and the steering device are driven by an open hydraulic system, and at least one of an oil return port of the hydraulic system of the working device and an oil return port of the hydraulic system of the steering device is communicated with an oil inlet of the radiator.
The return oil of the hydraulic system of the working device and the return oil of the hydraulic system of the steering device may be wholly or partially dissipated by the radiator. The traveling device is driven by a hydrostatic system, in a closed loop in the hydrostatic system, return oil is circularly switched between high pressure and low pressure, and a radiator can only bear the low pressure, so that the heat cannot be radiated through the radiator.
Illustratively, the work machine vehicle is a loader.
As shown in fig. 1, a hydrostatic system of a traveling apparatus of a loader in the related art includes a hydraulic pump 1 and two hydraulic motors, and hydraulic oil circulates between the hydraulic pump 1 and the two hydraulic motors. The hydraulic motor comprises a first hydraulic motor 3 and a second hydraulic motor 4, and a shell oil return port 11 of the hydraulic pump, a shell oil return port 31 of the first hydraulic motor and a shell oil return port 41 of the second hydraulic motor are directly communicated with the oil tank 7 through rubber pipes. The hydrostatic system is replenished with oil by an oil replenishment pump 8 integrated on the hydraulic pump 1.
In the actual working process, the working loads of the hydraulic pump 1 and the hydraulic motors are different, and the temperatures of the hydraulic oil accumulated in the casings of the hydraulic components are different, for example, the first hydraulic motor 3 is operated all the time, and the second hydraulic motor 4 is operated intermittently; the oil temperature of the hydraulic oil in the casing of the first hydraulic motor 3 at this time is higher than the oil temperature in the casing of the second hydraulic motor 4. Because the shells of the hydraulic elements are not connected with each other, the oil temperature in the shells of the hydraulic elements is high or low, the sealing aging in the hydraulic elements with the overhigh oil temperature of the shells is accelerated, the leakage amount of the hydraulic elements is increased, and the volumetric efficiency is reduced. In the prior art, in order to protect hydraulic elements, an oil temperature sensor is also arranged at an oil return position of a shell, and if the oil temperature sensor detects that the oil temperature at a certain position of a hydrostatic system is too high, power limiting operation can be automatically carried out, so that the working efficiency of the loader can be influenced.
In order to solve the problems existing in the hydrostatic system in the prior art, as shown in fig. 2, the present embodiment further provides a hydrostatic system, which includes a hydraulic pump 1, a hydraulic motor, and a main oil tank 2, wherein the hydraulic pump 1 is communicated with the hydraulic motor to form a closed loop; two oil return ports are respectively arranged on a shell of the hydraulic pump 1 and a shell of the hydraulic motor, one oil return port of the hydraulic pump 1 is communicated with one oil return port of the hydraulic motor, and the other oil return port of the hydraulic motor is communicated with an oil return port of the main oil tank 2; the other oil return port of the hydraulic pump 1 is communicated with the main oil tank 2 through a backpressure valve 5 to form a serial oil return pipeline.
It should be noted that the two oil return ports on the housing of the hydraulic pump 1 and the two oil return ports on the housing of the hydraulic motor are disposed opposite to each other. For example, an oil return port is provided in each of the upper and lower portions of the housing. In the prior art, an oil return port convenient to connect is selected according to installation layout to be communicated with an oil tank 7 in order to facilitate installation of the whole machine. In the present embodiment, the two oil return ports on the housing of the hydraulic pump 1 and the two oil return ports on the housing of the hydraulic motor are both in communication with the hydraulic circuit of the hydrostatic system.
As an alternative to the hydrostatic system, the set pressure value of the back pressure valve 5 is smaller than the minimum rated pressure value of the housing of the individual hydraulic elements in the series return line. After the back pressure in the serial oil return pipeline of the shell of each hydraulic element exceeds the set pressure value of the back pressure valve 5, the back pressure valve 5 is opened, and the other oil return port of the hydraulic pump 1 is communicated with the main oil tank 2, so that the pressure peak value in the serial oil return pipeline is eliminated, and the hydraulic element is protected.
Regarding the minimum rated pressure values of the casings of the hydraulic components such as the hydraulic pump 1, the hydraulic motor and the like in the serial oil return pipeline, the rated pressure values of the casings of the hydraulic components of different manufacturers and different specifications are different by inquiring the parameters of the selected hydraulic pump and the selected hydraulic motor.
The back pressure valve 5 is preferably a check valve that can achieve one-way conduction of the hydraulic fluid in the hydraulic pump 1 to the main tank 2. Furthermore, the back pressure valve 5 is only opened when the pressure in the series return line of the hydrostatic system is too great.
The back pressure valve 5 may be a combination of a pressure control valve for controlling the flow direction and a check valve with a minimum opening pressure, and the pressure control valve may have a set pressure value smaller than a minimum rated pressure value of the casings of the hydraulic components such as the hydraulic pump 1 and the hydraulic motor to protect the casings of the respective hydraulic components.
By communicating one oil return port of the shell of the hydraulic pump 1 with one oil return port of the shell of the hydraulic motor and communicating the other oil return port of the shell of the hydraulic motor with the oil return port of the main oil tank 2, the oil return of the shells of various hydraulic elements in the hydrostatic system is connected in series, since the other oil return port of the hydraulic pump 1 is connected to the main oil tank 2 through the back pressure valve 5, when the back pressure in the series circuit of the housings of the respective hydraulic elements is lower than the set pressure value of the back pressure valve 5, the back pressure valve is closed, the oil can only flow in series from the shell of the hydraulic pump 1 to the main oil tank 2 through the shell of the hydraulic motor, the internal oil temperature of each hydraulic element is kept consistent, and the phenomenon that the sealing aging inside the hydraulic element is accelerated due to overhigh oil temperature of return oil of the shell of part of the hydraulic element, so that the leakage amount of the hydraulic element is large and the volumetric efficiency is reduced is avoided; when the back pressure in the serial oil return pipeline of the shell of each hydraulic element exceeds the set pressure value of the back pressure valve 5, the back pressure valve 5 is opened, so that the pressure peak value of the shell loop of each hydraulic element can be eliminated, and the hydraulic elements are protected.
As an alternative of the hydrostatic system, the hydrostatic system further comprises an oil supplementing pump 8 and a secondary oil tank 6, an oil inlet of the secondary oil tank 6 is communicated with an oil outlet of a radiator 100 of the engineering machinery vehicle, an oil outlet of the secondary oil tank 6 is communicated with an oil inlet of the oil supplementing pump 8, and an oil outlet of the oil supplementing pump 8 is communicated with an oil inlet of the hydraulic pump 1.
The whole or part of the return oil of the hydraulic system of the working device and the return oil of the hydraulic system of the steering device in the loader are radiated by the radiator 100, the hydraulic oil cooled by the radiator 100 enters the auxiliary oil tank 6, the hydraulic oil in the auxiliary oil tank 6 is supplied to the oil supplementing pump 8, and the oil supplementing pump 8 supplements the oil for the hydraulic pump 1.
Low-temperature hydraulic oil of the hydraulic pump 1 is supplied to the hydrostatic system through the oil supply pump 8 to dissipate heat, so that the transmission efficiency of the hydraulic pump 1 and the hydraulic motor in the hydrostatic system is improved.
As an alternative to the hydrostatic system, a communication line 9 is provided between the secondary tank 6 and the main tank 2, and when the secondary tank 6 is filled with oil, the oil contained therein can enter the main tank 2 through the communication line 9. The return oil in the hydraulic system of the working device and the return oil in the hydraulic system of the steering device cooled by the radiator 100 are preferentially supplied to the sub-tank 6 to ensure the oil replenishment of the hydrostatic system, and the surplus oil is returned to the main tank 2.
As an alternative to the hydrostatic system, the communication line 9 is provided with a switching valve which is controlled to open when the secondary tank 6 is filled with oil, so that the oil in the secondary tank 6 is introduced into the main tank 2 through the communication line 9.
Still be provided with level sensor in the bellytank 6, level sensor is arranged in detecting the liquid level in the bellytank 6, and ooff valve and level sensor all are connected with the control unit electricity of loader, and when level sensor detected the liquid level in the bellytank 6 and reached the maximum limit value, the control unit of sending signal for the loader, the control unit of loader received the signal back control ooff valve that level sensor sent and opened. When the liquid level sensor detects that the liquid level in the auxiliary oil tank 6 reaches the minimum value, the liquid level sensor sends a signal to a control unit of the loader, and the control unit of the loader controls the switch valve to be closed after receiving the signal sent by the liquid level sensor. The maximum and minimum values are set by those skilled in the art according to actual circumstances, and are not particularly limited herein.
In the utility model discloses in another optional embodiment, the intercommunication pipeline 9 includes the oil inlet 91 of intercommunication pipeline, and the oil inlet 91 of intercommunication pipeline communicates with the top of bellytank 6, and when fluid in the bellytank 6 reached the oil inlet 91 of intercommunication pipeline, fluid in the bellytank 6 got into main tank 2 through intercommunication pipeline 9. An oil inlet 91 of the communicating pipeline is communicated with the upper part or the top of the auxiliary oil tank 6, and an oil outlet of the auxiliary oil tank 6 is lower than the oil inlet 91 of the communicating pipeline. When the oil in the secondary oil tank 6 reaches the oil inlet 91 of the communication pipeline, the oil in the secondary oil tank 6 can automatically enter the main oil tank 2 through the communication pipeline 9.
As an alternative to the hydrostatic system, the supplementary oil pump 8 is integrated in the hydraulic pump 1. In the present embodiment, the hydraulic pump 1 is a plunger pump, and the plunger pump is integrated with an oil replenishment pump 8, a proportional valve for controlling the change in the displacement of the plunger pump, a high-pressure relief valve for controlling the pressure of the hydrostatic system, and the like, and this arrangement provides a high degree of integration.
As an alternative to the hydrostatic system, the hydraulic motors include a first hydraulic motor 3 and a second hydraulic motor 4, the hydraulic pump 1 includes an upper oil return port 111 of a housing of the hydraulic pump and a lower oil return port 112 of the housing of the hydraulic pump, the first hydraulic motor 3 includes an upper oil return port 311 of a housing of the first hydraulic motor and a lower oil return port 312 of the housing of the first hydraulic motor, and the second hydraulic motor 4 includes an upper oil return port 411 of a housing of the second hydraulic motor and a lower oil return port 412 of a housing of the second hydraulic motor; the lower oil return port 112 of the housing of the hydraulic pump is communicated with the lower oil return port 312 of the housing of the first hydraulic motor, the upper oil return port 311 of the housing of the first hydraulic motor is communicated with the lower oil return port 412 of the housing of the second hydraulic motor, and the upper oil return port 411 of the housing of the second hydraulic motor is communicated with the oil return port of the main oil tank 2; an upper oil return port 111 of the hydraulic pump casing communicates with the main tank 2 through the back pressure valve 5.
The first hydraulic motor 3 is used to drive the front axle of the loader and the second hydraulic motor 4 is used to drive the rear axle of the loader. In the hydrostatic system, oil return ports of all hydraulic elements are connected through rubber pipes, connectors are arranged at two ends of each rubber pipe, and the rubber pipes are connected with the oil return ports through the connectors. The starting element in the series oil return pipeline is a hydraulic pump 1, an upper oil return port of the shell is a downstream outlet of the series oil return pipeline, and an upper oil return port of the shell is an upstream inlet of the series oil return pipeline.
The hydrostatic system provided by the embodiment can also be applied to other engineering machinery vehicles such as a land scraper, a bulldozer or a road roller.
The traveling device of the engineering machinery vehicle adopts the hydrostatic system, the oil return of each hydraulic element in the hydrostatic system is communicated, the oil temperature balance can be achieved, the reliability and the volume efficiency of each hydraulic element are improved, and the engineering machinery vehicle can work more efficiently and saves energy.
The above description is only for the preferred embodiment of the present invention, and for those skilled in the art, there are variations on the detailed description and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention.
Claims (10)
1. A hydrostatic system is characterized by comprising a hydraulic pump (1), a hydraulic motor and a main oil tank (2), wherein the hydraulic pump (1) is communicated with the hydraulic motor to form a closed loop; two oil return ports are respectively arranged on a shell of the hydraulic pump (1) and a shell of the hydraulic motor, one oil return port of the hydraulic pump (1) is communicated with one oil return port of the hydraulic motor, and the other oil return port of the hydraulic motor is communicated with an oil return port of the main oil tank (2); and the other oil return port of the hydraulic pump (1) is communicated with the main oil tank (2) through a backpressure valve (5) to form a serial oil return pipeline.
2. The hydrostatic system of claim 1, characterized in that the hydrostatic system further comprises an oil supplementing pump (8) and a secondary oil tank (6), an oil inlet of the secondary oil tank (6) is communicated with an oil outlet (102) of a radiator of an engineering machinery vehicle, an oil outlet of the secondary oil tank (6) is communicated with an oil inlet of the oil supplementing pump (8), and an oil outlet of the oil supplementing pump (8) is communicated with an oil inlet of the hydraulic pump (1).
3. The hydrostatic system according to claim 2, characterized in that a communication line (9) is provided between the secondary tank (6) and the main tank (2), through which communication line (9) the oil contained in the secondary tank (6) can enter the main tank (2) when it is filled with oil.
4. The hydrostatic system according to claim 3, characterized in that the communication line (9) is provided with a switching valve which is controlled to open when the secondary tank (6) is filled with oil, so that oil in the secondary tank (6) enters the main tank (2) through the communication line (9).
5. The hydrostatic system according to claim 3, characterized in that the communication line (9) comprises an oil inlet (91) of the communication line, the oil inlet (91) of the communication line communicating with the upper side of the secondary oil tank (6), when the oil in the secondary oil tank (6) reaches the oil inlet (91) of the communication line, the oil in the secondary oil tank (6) enters the main oil tank (2) through the communication line (9).
6. The hydrostatic system of claim 2, characterized in that the oil replenishment pump (8) is integrated in the hydraulic pump (1).
7. The hydrostatic system according to claim 1, characterized in that the set pressure value of the back pressure valve (5) is smaller than the minimum rated pressure value of the housing of the individual hydraulic elements in the series return line.
8. The hydrostatic system according to any one of claims 1-7, characterized in that the hydraulic motors comprise a first hydraulic motor (3) and a second hydraulic motor (4), the hydraulic pump (1) comprising an upper return port (111) of the housing of the hydraulic pump and a lower return port (112) of the housing of the hydraulic pump, the first hydraulic motor (3) comprising an upper return port (311) of the housing of the first hydraulic motor and a lower return port (312) of the housing of the first hydraulic motor, the second hydraulic motor (4) comprising an upper return port (411) of the housing of the second hydraulic motor and a lower return port (412) of the housing of the second hydraulic motor;
a lower oil return port (112) of a shell of the hydraulic pump is communicated with a lower oil return port (312) of a shell of the first hydraulic motor, an upper oil return port (311) of the shell of the first hydraulic motor is communicated with a lower oil return port (412) of a shell of the second hydraulic motor, and an upper oil return port (411) of the shell of the second hydraulic motor is communicated with an oil return port of the main oil tank (7); and an upper oil return port (111) of a shell of the hydraulic pump is communicated with the main oil tank (2) through the backpressure valve (5).
9. A construction machine vehicle, characterized by comprising a running gear, a working gear, a steering gear and a radiator (100), the running gear being driven by a hydrostatic system according to any one of claims 1-8, the main oil tank (2) supplying oil to the running gear, the working gear and the steering gear being driven by an open hydraulic system, at least one of an oil return of a hydraulic circuit of the working gear and an oil return of a hydraulic circuit of the steering gear being in communication with an oil inlet of the radiator (100).
10. The work machine vehicle of claim 9, wherein the work machine vehicle is a loader.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221215363.3U CN217381065U (en) | 2022-05-18 | 2022-05-18 | Hydrostatic system and engineering machinery vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221215363.3U CN217381065U (en) | 2022-05-18 | 2022-05-18 | Hydrostatic system and engineering machinery vehicle |
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| CN217381065U true CN217381065U (en) | 2022-09-06 |
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| CN202221215363.3U Active CN217381065U (en) | 2022-05-18 | 2022-05-18 | Hydrostatic system and engineering machinery vehicle |
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